Resin composition for sealing stator and method for disassembling stator

Abstract

A resin composition for a stator, which is used for forming a sealing member in a stator including a stator core having a plurality of teeth parts and a plurality of slots that are alternately formed in a circumferential direction, a coil wound around the slot, accommodated in the slot, and having a pair of coil ends that each protrude over both sides from the stator core in an axial direction, and a sealing member provided by covering the coil in the slot, the resin composition for a stator including a thermosetting component, in which a cured product obtained by thermally curing the resin composition for a stator has a structure represented by Formula (1) and has an easily disassembling property. (In Formula (1), R1 and R2 each independently represent any of a hydrogen atom, a hydrocarbon group or aromatic group having 1 to 30 carbon atoms, a hydroxyl group, and an alkoxyl group having 1 to 30 carbon atoms.)

1 . A resin composition for sealing a stator, which is used for forming a sealing member in a stator including a stator core having a plurality of teeth parts and a plurality of slots that are alternately formed in a circumferential direction, a coil wound around the slot, accommodated in the slot, and having a pair of coil ends that each protrude over both sides from the stator core in an axial direction, and a sealing member provided by covering the coil in the slot, the resin composition for a stator comprising:
 a thermosetting component,   wherein a cured product obtained by thermally curing the resin composition for a stator has a structure represented by Formula (1) and has an easily disassembling property,   
       
         
           
           
               
               
           
         
         wherein in Formula (1), R 1  and R 2  each independently represent any of a hydrogen atom, a hydrocarbon group or aromatic group having 1 to 30 carbon atoms, a hydroxyl group, or an alkoxyl group having 1 to 30 carbon atoms. 
       
     
     
         2 . The resin composition for sealing a stator according to  claim 1 ,
 wherein the thermosetting component has a —Si—O— structure.   
     
     
         3 . The resin composition for sealing a stator according to  claim 1 ,
 wherein the thermosetting component contains a thermosetting resin and a curing agent, and   wherein both the thermosetting component and the curing agent have a —Si—O— structure.   
     
     
         4 . The resin composition for sealing a stator according to  claim 1 ,
 wherein the thermosetting component contains a thermosetting resin and a curing agent, and   wherein the curing agent has a —Si—O— structure.   
     
     
         5 . The resin composition for sealing a stator according to  claim 3 ,
 wherein the curing agent includes a phenol-based curing agent.   
     
     
         6 . The resin composition for sealing a stator according to  claim 1 ,
 wherein the thermosetting component contains a thermosetting resin and a curing agent, and   wherein the thermosetting resin has a —Si—O— structure.   
     
     
         7 . The resin composition for sealing a stator according to  claim 5 ,
 wherein the thermosetting resin includes one or two or more selected from an epoxy resin, a phenoxy resin, a polyimide resin, a benzoxazine resin, an unsaturated polyester resin, a phenol resin, a melamine resin, a silicone resin, a cyanate resin, a bismaleimide resin, and an acrylic resin.   
     
     
         8 . The resin composition for sealing a stator according to  claim 5 ,
 wherein the thermosetting resin includes an epoxy resin.   
     
     
         9 . The resin composition for sealing a stator according to  claim 1 , further comprising:
 an inorganic filler,   wherein a content of the inorganic filler is 10% to 98% by mass with respect to a total amount of the resin composition for sealing a stator.   
     
     
         10 . The resin composition for sealing a stator according to  claim 1 , further comprising:
 a silyl ether-modified novolac resin.   
     
     
         11 . The resin composition for sealing a stator according to  claim 1 , further comprising:
 a phenol resin having a weight-average molecular weight (Mw) of 500 to 10000.   
     
     
         12 . The resin composition for sealing a stator according to  claim 1 ,
 wherein the resin composition for sealing a stator is in a form of a powdery, granular, tablet, or sheet shape.   
     
     
         13 . A stator comprising:
 a stator core having a plurality of teeth parts and a plurality of slots that are alternately formed in a circumferential direction;   a coil wound around the slot, accommodated in the slot, and having a pair of coil ends that each protrude over both sides from the stator core in an axial direction; and   a sealing member provided by covering the coil in the slot,   wherein the sealing member is formed of a cured product of the resin composition for sealing a stator according to  claim 1 .   
     
     
         14 . A method for disassembling the stator according to  claim 13 , the method comprising:
 a step of immersing the stator in a solvent to disassemble the cured product of the resin composition for sealing a stator.   
     
     
         15 . The method for disassembling the stator according to  claim 14 ,
 wherein the solvent is a solvent containing a fluorine ion.   
     
     
         16 . The method for disassembling the stator according to  claim 14 , wherein the immersion is performed at −20° C. to 200° C. 
     
     
         17 . The method for disassembling the stator according to  claim 14 ,
 wherein the immersion is performed at 5° C. to 30° C.   
     
     
         18 . A recycling method for a material constituting the stator according to  claim 13 , the recycling method comprising:
 a step of immersing the stator in a solvent to disassemble the cured product; and   a step of recovering the material from the stator.